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L +U e e. h S H e 6 h S 2 8-. N R A E K R m d o M 0 m ELBOW FOR PIPES.

m 1w? W m v a n m w X N, PETERS, Phowumu n hu. Washmglon. n. c.

(No Model.) 2 Sheets-Sheet 2.

P. KEARNS.

ELBOW POR'PIPES. 2 No. 262,049. Patented Aug. 1, 1882.

M8668. fizveui'oz WAJJ- /mn22fi N PETERS Phulmmhu m hur. Washinghm. D404 PATENT OFFICE.

PATRICK KEARNS, OF WILMINGTON,

DELAWARE, ASSIGNOR TO FLINN 85 JACKSON, OF SAME PLACE.

ELBOW FOR PIPES.

SPECIFICATION forming part of Letters Patent No. 262,049, dated August1, 1882. Application filed June 6, 1882. '(No model.)

To all whom it may concern:

Be itknown that 'I, PATRICK KEARNS, a citizen of the United States,residing at Wilmingpipes, and the like in which the two parts of thepipe at the elbow areformed of any desired kind of metal and adjustablyjointed together, so that the elbow can be adjusted to any desiredangle.

The objects of my invention are to increase the facility for the-passageof smoke through the elbow, to increase the capacity for radiating heat,and to provide for applying the elbow topipes of varying diameter. Theseobjects I attain by forming the adjustable jointed elbow as illustratedin the accompanying drawings, in which- Figure 1 illustrates the way inwhich the blanks for forming the two parts or sections of the elbow arecut out from a sheet of metal. Fig. 2 illustrates the elbow formed fromthese blanks, and Fig.3 illustrates the same with the parts adjusted toa different angle. Fig.4 is a section taken longitudinally through theelbow; and Fig. 5 is a transverse section taken through Fig. 4 on theline w as, looking in the direction of the arrow.

Referring by letter to the drawings, let A indicate the sheet-metalblank for forming one section of the elbow, and B the blank for formingthe remaining section thereof. These blanks are each formed with acurved edge, 0, which constitutes the outer end of the section when theblank is bent into pipe form. The straight side edges, D, which form theseam, commence at the edge 0, and diverge from each other so as togradually increase the diameter of the section toward the joint of theelbow. The blank A extends forward considerably in advance of a linebetween the ends of these diverging edges D, and has a double curvededge, E, the curves 6, on the opposite sides of this extension 6, beingmade inwardly,

and the curve 0 between these two curves, be-.

ing made outwardly, as shown. The blank B is formed with the curved endedge 0 and the straight diverging side edges, D, the same as in blank A.Its remaining end edge E is formed just the reverse of the end edge E inblank 'A-that is to say, instead of having the extension 0, a portion ofthe blank corresponding to said extension is removed, so that the blankhas at its said end edge the inwardly-curved middle portion, 0 and thetwo curved portions 6 between its corners and the curved part 0 thesecurved parts 6 having a gradual curvature, which is the reverse of thecurved part 0 This construction saves material in cutting out the blanksfrom a metal sheet, which latter is illustrated by the dotted line E,from which it will be seen that the metal removed to form theinwardly-curved ed gc of blank B constitutes the extended end 6 of theblank A. The dotted lines shown in the two blanks indicate the lineswhere the bends occur in forming the complete sections of the elbow. Inmaking the said elbow the blanks are bent into tubularform,and each isfolded along its edges D, so as to form a seam, F. The blank A is bentalong its curved edge E, so as to form a curled lip or head, G, and theedge of the blank B is turned up so as to tit and work in the said bead.

It will thus be seen that the sectional area of the elbow is greater atits joint, each section of the elbow having a gradual taper from thejoint to its end. By reason of such conical or tapering construction ofthese sections an enlarged elbow can be provided for a coinparativelysmall pipe; or, it it is desired to fit in a somewhat larger pipe, itwill only be necessary to cut ofi a portion of each end of the sectionscomposing the elbow. The increased area of the elbow at the jointafi'ords increased facility for the passage of smoke and heat, and alsoan increased heating-surface is obtained. In turning the two sections ofthe elbow at any desired angle the area of the passage will not bedecreased, nor will there be any obstruction made therein to the passageof heat and smoke.

It will also be observed that but two parts only are employed forforming the elbow and itsjoint, and hence a simple and cheap jointedelbow is obtained.

Heretofore stove-pipe elbows have been composed of two pipe-sections ofuniform diameter from end to end and adjustably connected together atone end; but such construction difl'ers from mine in that I make thesections of novel form to enlarge the cross-sectional area of the elbowatthe bend orjoint, and toprovide for the connection of the elbow withpipes of varying diameter. Further, blanks for stovepipe elbows haveheretofore been formed with parallelstraight edges at the ends, astraight edge at one side, and a curved edge at the opposite side, formaking a right-angled elbow, the sections of which are immovably united;but such construction differs from mine in that I provide the ends ofthe blank with diverging edges and curve the opposite sides of eachlank, whereby I obtain an elbow in which the pipe-sections taper andstand at right angles .to each other to produce the results hereinbeforestated.

Having thus described my invention, what I claim is- 1. A stove-pipeelbow composed of two tapering pipe-sections swiveled together at theirlarger ends, substantially as and for the purpose described.

2. A stove-pipe elbow composed of two tapering pipe-sections swiveledtogether at their larger ends by bending the edge of one section to forma bead and turning up the edge of the other section to embrace the bead,substantially as and for the purpose described.

3. The blanks herein described for forming a pipe-elbow of two taperingsections swiveled at their larger ends, said blanks being formed withthe inward end curves 0 and two straight edges, D, diverging from theends of said curves, and one of the blanks being formed with the inwardend curve E and the other blank with the outward double-curved edge, E,substantially as shown, and for the purposes described.

In testimony whereoi'Ihave hereunto set my hand in the presence of twosubscribing witnesses.

PATRICK KEARNS. Witnesses:

GEO. H.'MUR1 HEY, LEVI A. BERTOLETTE.

